[libcalamaresui] Fix sidebar label for setup mode

In the sidebar, the "Install" step should be named "Set Up" when in
setup mode, which will be more consistent with the other UI texts,
including button labels.

Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>

src/libcalamaresui/ExecutionViewStep.cpp

@@ -78,7 +78,9 @@ ExecutionViewStep::ExecutionViewStep( QObject* parent )
 QString
 ExecutionViewStep::prettyName() const
 {
-    return tr( "Install" );
+    return Calamares::Settings::instance()->isSetupMode()
+        ? tr( "Set up" )
+        : tr( "Install" );
 }